The therapist is preparing to perform a spontaneous breathing ...

[stephzh]

The therapist is preparing to perform a spontaneous breathing trial according to a weaning from the mechanical ventilation weaning protocol. Which of the following methods can accomplish this effort? I. using pressure control ventilation with SIMV at a rate of 4 breaths/minute II. having the patient breath through a T-piece or a Briggs adaptor III. applying pressure support ventilation at 6 cm H2O IV. administering continuous positive airway pressure at 5 cm H2O
 
  A. II only
  B. I, III, IV only
  C. I, II, III only
  D. II, III, IV only

Question 2

Which of the following indexes is a useful predictor of ventilatory muscle fatigue?
 
  A. pressure-time product
  B. pressure-time index
  C. Pesophageal/Ppleural
  D. f /Vt

[ririgirl15]

Answer to Question 1

ANS: D
A. Incorrect response: See explanation D.
B. Incorrect response: See explanation D.
C. Incorrect response: See explanation D.
D. Correct response: The spontaneous breathing trial (SBT) involves an integrated patient assessment during spontaneous breathing protocol with little or no ventilator assistance. The SBT can be accomplished by (1) using a T-piece (Briggs adaptor), (2) using a low level of CPAP (5 cm H2O), or (3) a low level of PSV (5 to 7 cm H2O) for at least 30 minutes, but no longer than 120 minutes.

Answer to Question 2

ANS: B
A. Incorrect response: See explanation B.
B Correct response: Multiplying the PTP/MIP by the inspiratory time fraction (Ti/Ttotal), that is,

The PTI is a useful predictor of ventilatory muscle fatigue.
C. Incorrect response: See explanation B.
D. Incorrect response: See explanation B